First Author | Karnati S | Year | 2018 |
Journal | PLoS One | Volume | 13 |
Issue | 9 | Pages | e0203466 |
PubMed ID | 30212482 | Mgi Jnum | J:267062 |
Mgi Id | MGI:6200665 | Doi | 10.1371/journal.pone.0203466 |
Citation | Karnati S, et al. (2018) PPARalpha-mediated peroxisome induction compensates PPARgamma-deficiency in bronchiolar club cells. PLoS One 13(9):e0203466 |
abstractText | Despite the important functions of PPARgamma in various cell types of the lung, PPARgamma-deficiency in club cells induces only mild emphysema. Peroxisomes are distributed in a similar way as PPARgamma in the lung and are mainly enriched in club and AECII cells. To date, the effects of PPARgamma-deficiency on the overall peroxisomal compartment and its metabolic alterations in pulmonary club cells are unknown. Therefore, we characterized wild-type and club cell-specific PPARgamma knockout-mice lungs and used C22 cells to investigate the peroxisomal compartment and its metabolic roles in the distal airway epithelium by means of 1) double-immunofluorescence labelling for peroxisomal proteins, 2) laser-assisted microdissection of the bronchiolar epithelium and subsequent qRT-PCR, 3) siRNA-transfection of PPARgammaand PPRE dual-luciferase reporter activity in C22 cells, 4) PPARg inhibition by GW9662, 5) GC-MS based lipid analysis. Our results reveal elevated levels of fatty acids, increased expression of PPARalpha and PPRE activity, a strong overall upregulation of the peroxisomal compartment and its associated gene expression (biogenesis, alpha-oxidation, beta-oxidation, and plasmalogens) in PPARgamma-deficient club cells. Interestingly, catalase was significantly increased and mistargeted into the cytoplasm, suggestive for oxidative stress by the PPARgamma-deficiency in club cells. Taken together, PPARalpha-mediated metabolic induction and proliferation of peroxisomes via a PPRE-dependent mechanism could compensate PPARgamma-deficiency in club cells. |